CVE-2023-38562: A double-free vulnerability exists in the IP header loopback parsing functionality of Weston Embedded uC-TCP-I

This week

HIGH 8.7REMOTEDOWNGRADE

CVE-2023-38562 is a high-severity flaw (CVSS 8.7) affecting uc-tcp-ip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A double-free vulnerability exists in the IP header loopback parsing functionality of Weston Embedded uC-TCP-IP v3.06.01. A specially crafted set of network packets can lead to memory corruption, potentially resulting in code execution. An attacker can send a sequence of unauthenticated packets to trigger this vulnerability.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-415
Published	2024-02-20
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: weston-embedded

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-02-20 15:15 UTCPublished CVE record published
2026-06-17 06:10 UTCUpdated Record last modified

weston-embedded uc-tcp-ip DOWNGRADE

Affected: 3.06.01

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.06.01

1. Check installed version

apt-cache policy uc-tcp-ip || rpm -q uc-tcp-ip || uc-tcp-ip --version

2. No fixed release: DOWNGRADE to a release before 3.06.01 (Debian / Ubuntu)

apt-cache madison uc-tcp-ip sudo apt install uc-tcp-ip=<VERSION_BEFORE_3.06.01> sudo apt-mark hold uc-tcp-ip

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list uc-tcp-ip sudo dnf downgrade uc-tcp-ip-<VERSION_BEFORE_3.06.01> sudo dnf versionlock add uc-tcp-ip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-38562?

uc-tcp-ip: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-38562 being exploited?

CVE-2023-38562 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-38562 affect?

CVE-2023-38562 affects uc-tcp-ip. Severity is high (CVSS 8.7). A double-free vulnerability exists in the IP header loopback parsing functionality of Weston Embedded uC-TCP-IP v3.06.01. A specially crafted set of network packets can lead to memory corruption, potentially resulting in code execution. An

How urgent is CVE-2023-38562?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-39541 MEDIUM 5.9 DOWNGRADE A denial of service vulnerability exists in the ICMP and ICMPv6 parsing functionality of Weston Embedded uC-TC
CVE-2023-39540 MEDIUM 5.9 DOWNGRADE A denial of service vulnerability exists in the ICMP and ICMPv6 parsing functionality of Weston Embedded uC-TC

References

← Back to latest CVEs